Chance Technical Design Manual

SS175 HELICAL PILE AND ANCHOR PRODUCT SPECIFICATIONS

Hot-rolled round-cornered-square (RCS) solid steel bars per ASTM A29; modified AISI 1530 with 90 ksi minimum yield strength

SHAFT

CORRODED

SHAFT SIZE

1.75 in 44.4 mm

1.737 in

44 mm

CORRODED

0.75 in 4

31.1 cm 4

MOMENT OF INERTIA (I)

0.725 in 4

30.1 cm 4

CORRODED

3.1 in 2

19.4 cm 2

SHAFT AREA (A)

2.97 in 2

19.16 cm 2

CORRODED

DRAWINGS & RATINGS

SECTION MODULUS (S x-x ) 0.85 in 3

13.9 cm 3

0.835 in 3

13.65 cm 3

CORRODED

PERIMETER

6.6 in

16.7 cm

6.5 in

16.5 cm

COUPLING

Integral forged square deep socket

One 7/8 inch diameter ASTM A193 Grade B7 hex head bolt with threads excluded from shear planes 0.375 & 0.5 inch thick, formed on matching metal dies, ASTM A656 Grade 80 or better Hot dip galvanized per ASTM A153 Class B-1, 3.1 mil minimum thickness or bare steel

COUPLING BOLTS

HELIX PLATES

COATINGS

TORQUE PROPERTIES TORQUE CORRELATION FACTOR

10 ft -1

33 m -1

TORQUE RATING

10,500 ft∙lb

14,240 N∙m

STRUCTURAL CAPACITY

NOMINAL

LRFD DESIGN

TENSION STRENGTH

100 kip 445 kN 75 kip

334 kN

ALLOWABLE TENSION STRENGTH

50 kip

222 kN

TORQUE-CORRELATED CAPACITY CAPACITY LIMIT BASED ON TORQUE CORRELA TION, TENSION / COM PRESSION 105 kip

ASSEMBLY OF SS175 FIGURE 7-10

ULTIMATE

ALLOWABLE

467 kN 52.5 kip 234 kN

ASD ALLOWABLE COMPRESSION STRENGTHS OF CHANCE ® TYPE SS175 HELICAL PILE LEAD & EXTENSION SECTIONS 1,2

ASD ALLOWABLE AXIAL COMPRESSION STRENGTH (kip) [kN] FIRM SOIL

SECTION TYPE & HELIX COUNT

SOFT SOIL

FIXED

PINNED

FIXED PINNED

Lead, Single Helix Lead, Single 12” Helix Lead, Single 14” Helix Lead, 2-Helix 8”-10” Lead, 2-Helix 10”-12” Lead, 2-Helix 12”-14” Lead, 2-Helix 14”-14”

30.2 [134.3] 28.7 [127.7] 25.9 [115.2]

See Helix Strength Table Above

See Helix Strength Table Above

15.4 [68.5]

94.7 [421.2] 61.8 [274.9] 54.6 [242.9] 51.8 [230.4] 98.4 [437.7] 98.4 [437.7]

61.7 [274.5] 61.7 [274.5] 54.6 [242.9] 51.8 [230.4] 61.7 [274.5] 61.7 [274.5]

30.2 [134.3]

15.4 [68.5]

Lead, Multi-Helix

30.2 [134.3] 30.2 [134.3]

15.4 [68.5] 15.4 [68.5]

Extension

Notes: For SI: 1 kip = 4.448 kN. 1 Refer to Section 4.1.3 of ESR-2794 for descriptions of fixed condition, pinned condition, soft soil, and firm soil. 2 Strength ratings are based on a design corrosion level of 50 years and presume the supported structure is braced in accordance with IBC Section 1808.2.5 and the lead section with which the extension is used will provide sufficient helix capacity to develop the full shaft capacity.

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